Windows 7 as Virtual Box guest os, after starting a while, the keyboard is not respond

Hi, guys,
Windows 7 as Virtual Box guest os, after starting a while, the keyboard is not respond, does anybody knows this issue. how can I solve, thanks a lot.
My env: FreeBSD 12.2-RELEASE r366954 GENERIC amd64, Windows 7 as virtualbox guest os.
 
When I had a Windows 7 guest, I don't recall any such problem.
No problem with a Windows 10 guest.

Have you tried the VirtualBox forum? If you post there, link to it from here. Thanks.
 
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